docs: def check_acknowledgment(self, ds):
          '''
          Check if acknowledgment/acknowledgment attribute is present. Because
          acknowledgement has its own check, we are keeping it out of the Global
          Attributes (even though it is a Global Attr).
  
          :param netCDF4.Dataset ds: An open netCDF dataset
          '''
          check = False
          messages = []
          if hasattr(ds, 'acknowledgment') or hasattr(ds, 'acknowledgement'):
              check = True
          else:
              messages.append("acknowledgment/acknowledgement not present")
  
          # name="Global Attributes" so gets grouped with Global Attributes
          return Result(BaseCheck.MEDIUM, check, "Global Attributes", msgs=messages)